"But they got an engineer in who presumably just pushed the reset button and said the car wash was fine.

"Morrisons said to me they didn't deny that the incident took place but because the car wash was fine beforehand and now the engineer said it's working, it's not their liability.

"They are completely washing their hands of it."

David — who is the managing director of a fitness equipment company — spoke to the car wash manager immediately after the incident at 8.15am on July 30.

He then phoned Morrisons customer services who told him an engineer who they sent to check the car wash had reported no faults.

David, who lives with his wife Grizzie, 48, and two children Oskar, 15, and Georgina, 13, in Stow-on-the-Wold, Glos, added: "It makes you think what would have happened if my kids were in the back of the car.

"A lot of kids put their faces against the back window to watch the roomers. All sorts of horrible things could have happened.

"They should have reported it to the health and safety executive and done a proper investigation."

The Daily Star have spoken to Morrisons and a spokeswoman from the company has said that their investigation into the incident, which started on Friday, is still ongoing.

Morrison is refraining from making a statement until their investigation is completed.